Process of mounting pictures.



UNITED STATES PATENT OFFICE.

MARK L. OOWAN, OF EDDY, TEXAS.

PROCESS OF MOUNTING PICTURES.

LECIFIOATION forming part of Letters Patent No. 660,892, dated October30, 1900.

Application filed March 23. 1900, Serial No. 9,933. N0 specimens.)

To all whom it nutyconcern:

Be it known that I, MARKLYCOWAN, a citizen of the United States,residing at Eddy, in the county of McLennan and State of Texas, haveinvented certain new and useful Improve m en ts in Processes of MakingMedallion Pictures; and I do hereby declare the follow-' ing to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. 4

The object of this invention is the production of a variety of picturespresenting a lovelyand beautiful effect and of substantial and durablequality at the lowest possible cost, the produc having the appearance ofthe highest art.

A vital feature of the process resides in its capability ofpreservingphotographs and like prints and imparting a fresh, vigorous,and animated look thereto and to convert ordinary lithographic printsinto pictures closely resembling high-grade productions.

In practicing the invention ordinary panes of glass the size of thepicture, print, or lithograph to be moun ted are selected, cleaned, andpolished by being rubbed with powdered pumice-stone. A half-pound ofwhite glue is dis-- solved in one quart of boiling water, to which isadded one tablespoonful of spirits of an monia and one tablespoonful ofwhite sugar;

A thin coat of this mixture is applied :hot, by means of a brush orsponge, to one side of the glass plate, after which the print, picture,or

photograph is placed upon the coated side of the glass and the latterand the print passed between rubber pressure-rollers, by means of whichthe print is caused to adhere firmly and closely to the glass and alltraces of air and surplus solution areexcluded. The pressure may beapplied in any desired way, the mannerindicated being thesimplest andmost expeditious and uniform, and hence is preferred.Sugarwhen'dissolved producesacolorless liquid possessing adhesiveproperties and forms a firm bond between polished surfaces. Glue, as iswell known, tends to contract and when applied to glass causes thesurface to dissolving in hot water two parts Ohurchs- Ala-bastine to onepart plaster-of-paris, forminga mixture about the consistency of creamora thick paint. This mixture is applied hot to the back of the print bymeans of a brush or other suitable means. This coating excludes air andprevents dampness affecting the picture. Any good calcimine may be usedinstead of Ohurchs Alabastine.

Having thus described the invention, whatis claimed as newis- Theherein-described method of making medallion pictures, which consists it]applying to a polished glass plate a heated transparent paste containingammonia and sugar, placing the print on the coated side of the glass andsubjecting it to pressure to exclude all air, and finally coating therear of the article with a plastic solution adapted to harden andpermanently exclude air from the print and paste.

In testimony whereof I affix my signature in presence of two witnesses.

MARK L. COWAN.

Witnesses:

CLAUDE B HALL, D. C. HILL.

Ammonia tends to en--

